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SECURED FINANCING - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Repurchase Agreements:    
Netted amounts $ 64,310,276 $ 62,201,543 [1]
Repurchase agreements, weighted average remaining maturities 34 days 44 days
Repurchase agreements weighted average rate 5.23% 5.70%
Repurchase agreement amount $ 3,500,000  
Remaining capacity of repurchase agreement 2,200,000  
Fair value of collateral received for reverse repurchase agreements 2,700,000 $ 2,300,000
Fair value of securities sold 2,000,000 2,100,000
Other secured financing $ 600,000 500,000 [1]
Debt weighted average interest rate 8.05%  
Secured financings and interest rate swaps - collateral held, estimated fair value $ 69,300,000 68,200,000
Secured financings and interest rate swaps - collateral held, accrued interest 304,700 $ 279,500
Line of Credit | Mortgage Servicing Rights Committed Credit Facility    
Repurchase Agreements:    
Credit facility, maximum borrowing capacity $ 1,300,000  
Minimum    
Repurchase Agreements:    
Debt instrument, maturity 4 months  
Maximum    
Repurchase Agreements:    
Debt instrument, maturity 1 year  
[1]
(1)Derived from the audited consolidated financial statements at December 31, 2023.